Lisa Kristine inspires the world with her photography of people living in ancient and often horrific circumstances; much of her work focuses on vividly documenting slavery.

Kristine’s web site notes, “Lisa Kristine is a San Francisco based photographer specializing in indigenous peoples and cause related photography. Best known for her evocative and saturated use of color, her fine art prints are among the most sought after and collected in her field.”

In early 2012, 8-year-old Vivienne Harr saw a photo Kristine had taken of two slave children with rocks strapped to their heads, holding hands as they struggled under the weight of their backbreaking work. Vivienne was stunned to learn that nearly 30 million people are still held as slaves today and she decided to do something about it.

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With the help of her father, Eric Harr, Vivienne launched a campaign to raise money to fight child slavery. Starting with a lemonade stand, her efforts grew into a social enterprise with a remarkable 5 percent of revenue going the fight. Make-a-Stand Lemonade is now available in stores.

Harr’s success in raising money and awareness has brought her an unusual level of fame for a ten-year-old girl. Last year she was invited to help ring the closing bell at Twitter’s TWTR -2.44% IPO, representing the potential for Twitter to effect good.

Free the Slaves is one of the six carefully selected organizations that Make-a-Stand supports. Executive Director Maurice Middleberg describes its work as “on the ground with liberators around the world. We do what it takes to free men, women and children and help them stay free. Basic needs for food, shelter and safety from angry slave owners must be met. Then the system that allows slavery to flourish has to be dismantled and another created by former slaves learning to live in freedom.”